Dennis Cummins/Hanora Crow

Looking for information in regards to Dennis Cummins. This is what I know About Dennis. First of all he is my GG Grandfather. Born somewhere between 1821-1828. Dennis was a native of Cork Ireland. Checking passenger lists to america there was one Dennis Cummins that came directly from Cork to New York on the Ship Liberty May 21,1846. Other Dennis Cummins left from the Port of Liverpool to the US. Dennis married another Ireland Native Hanora Crow County unknown on April 15 1863 in Dubuque Iowa USA. Then settled there until his Death in 1893. Do not know if Dennis had any brothers or sister. Wanting to find out if there is anyone out there who may be related to this family. whether it be Dennis Cummin or Hanora Crow. Any information would be apprecitated. Thanks